I loooooooove Georgiana! And Josephine! Especially Georgiana though since that was the name of Mr. Darcy's younger sister in Pride and Prejudice Depending on the mn you pick I think Georgiana is very usable.

Georgiana is nice but a lot of name, I agree. I personally prefer Georgina, flows off the tongue a bit easier for me. Kate is my main nick name and I love it, but I do prefer it as a nickname and not given name. The thing I like about having Katherine and Katie at my disposal is that they're more flowy, feminine sounding (sometimes, oddly when I say it, Kate sounds a little abrupt). I don't mind just Kate in the middle spot though, especially with a long first name. (that 'just Kate' is what I've heard everyone say.. I know a few people with daughters/grand daughters named Kate, and they've all referred to their names as 'just Kate'.. Which makes it seem unfinished imo) Josephine is gorgeous!! I really like the name and maybe it's because I've never met an old lady with the name but it is not old sounding at all to me! I picture it on a curly haired little girl, actually.
All three names sound great together and would make a really nice sibling set or you could get good combos from them. JosephineKate, KatherineJosephine, GeorgianaKate...